Pencil sharpener



Oct. 1, 1929. w, H, WgNTERS 1,730,185

PENCIL SHARPENER Filed June 16. 1926 2 Sheets-Sheet 1 gru/vanto@WIW/mmm;

Oct. l, 1929. i w. H. wlNTERs PENCIL SHARPENER Filed June 16, 1926 2Sheets-Sheet lm, #s atto: n u',

flatente'd Oct. 1, 1929 fWILLIAM H. lINTERS, DULUTH, .MINNESOTA PENCILSHARPENER Application led .Tune i 16,

it is the purpose of the present invention to provide, in a pencilSharpener, a construction and arrangement of elements which areautomatic in their operations as a result 'of g, forcing the pencil tobe sharpened downwardly between the cutting members.

' Another purpose is the provision of a spiral threaded shaft toengagewith opposed teeth whereby rotary motion may 4be imparted to lothe shaft which, in turn, imparts movement to spiral pencil cutterson.the downward stroke of the shaft, said cutters being carried by aVframe under tension of tensioning A means to return the frame t'oinitial position without imparting movement to the cutters. Stillanother purpose is the provision of a tapered receiver for the receptionof the end of a-pencil for holding the latter .in position, whereby thecutters may remove a uniform surface from the end of the pencil.

' It is to be understood th'atthe particulars herein given are in noAway limitative and that,while still keeping within the scope oftheinvention, any desired modifications of -detail and desired proportionsmay be made in the apparatus according to the circumstances. i

The invention comprises further features and combinations of parts to'be hereinafter set forth, shown in the drawings and claimed.

In the drawings:

Figure 1 is 'a vertical sectional view of a pencil Sharpener constructedin accordance with the invention.

Figure 2 is a-plan view.

Figure 3 is an elevational view broken away at the upper end to presenta section at-right angles to that ,of Figure `1.

Figure 4 is a transverse sectional line 4 4 of Figure 1.

- Figure 5 is a transverse sectional view on line 5-5 of Figure 1.

Figure 6 is. a sectional view of the upper end of the shaft 5.

Referring to the drawings, 1 is'a casing view on upper end port-ion 3.Rising from. the bottom of the base i's a tubular shell 4 fortherec'eption of ar shaft 5 which has an exterior' spiral thread 6. Fixedin any suitable man- -and the shaft 5 will rotate together upon whichlcomprises a base 2'and a contracted 19 are the pintles ofthe cuttingrolls or cyl- 192e. .serial no.. 116,417.

ner upon the lupper end of the tubular shell is a cap 7 provided with anopeningS through which the shaft operates. v

The opening 8 has diametrically opposite.

lugs or teeth 9 which engage with the spiral 55 threads on the shaft 5,thereby adaptedvto cause revolnble movements to be imparted to the shaftupon depressing the same into the tubular Vshell 4. Where the contractedend portion `3 projects from the base 2, inwardly extending supports 10are provided for the support of the rods llfthe upper ends of which aremounted in bearings 12 of the arcuate top wall13 of the contracted endportion 3. The top wall 13 has a central opening v 14 through which theend of the pencil to be sharpened passes. Y

Mounted for up and down movement upon the' rods 11 is a ring gear 15,the inner margin of which has gear teeth 16, and depending from the ringgear are diametrically opposite arms 17 to the lower ends of which aringplate 18 is integrally connected. A base 19 with'its upper face 20gradually diverging outwardly and downwardly is supported on the ringplate 18. A stud 21 has its tapered head 22 fixed in any suitable mannerin the base 19, so as to rotate with the latter. The stud has its lowerend swiveled atv 23 in the upper end of the shaft 5.

While the stud is swiveled in the shaft 5, italsohas a slight axialmovement relative to the shaft. The upper end of the shaft has ratchetteeth 24 which are engaged by the ratchet teeth 25 on a shouldered partof the under face of the base 19. Upon applying pressure on the base 19,causing the ratchet teeth 25 toengage with the teeth 24, the basedownward movement of the sha t, and upon upward movement ofthe shaft,due to the slight axial -play ofthe stud in the shaft 5, the ratchetteeth will separate, thereby per- I mitting the base to remain idlewhile the shaft rotates. Q 95 A cap 26 is mounted concentric with thering .gear 15 and is fastened thereto, andjournaled in bearings ofthecap and the base inders 2Q'A which have spiral cutting threads 10o llyopposite portionsof the ring gear.

f Since the shaft' and the base 19 rotate upon downward movement of theshaft, the cutters swing around the end of the pencil` and due to theirgear-connections 29,'with the ring'gear, the gears themselves rotate,thereby causing the cutting threads of the cutters to remove uniformsurfaces from the pencil until the end of the pencil is sharpened. Uponimparting a downwardmovement to the shaft 5, the shaft will make atleast three revolutions while the cutters themselves will receive atleast twelve revolutions which, it is believed, will remove sufficientsurface from the end of the pencil to give the,Y pencil a sharpenedtapering point. The sharpened end of the pencil is tapered due to thelfact that the cutters 27 diverge upwardlyfrom each other, their lowerend faces being parallel with the conical face of thebase 1 Y A support30 with a tapered'bore de ends from the cap .26 with thebore concentricwith an opening 31 in the cap. This support with its bore constitutesmeans to receive the end of the pencil when applied between the cutters,thereby holding the pencil firmly',

whereby uniform shavingsmay be removed from the end of the pencil by thecutters during their revoluble movements.

Suitable springs 32 are in surroundin relation to the rods 11 and areinterpose` between the supports 1() and the ring gear- 15, therebyacting to return the frame to its raised position after having beendepressed.

In the operation, a pencil to be sharpened may be inserted through theopening of the top 13 and through the opening of the cap 26 so that theend of the pencil will enter the tapered bore of the support 30.Pressure is applied upon the pencil suiiiciently to cause theshaft 5 tomove axially into the tubular shell, and due to the teeth or lugs 9engaging the'spiral thread of the shaft, the shaft receives revolublemovement as well as the base 19. Due to the base rotating, the cuttersswing around the surface of the pencil and due to this movement andtheir gear connections with the ring gear, the cutters themselves rotateupon 4their diverging axis so that the spiral cutting thread ofthecutters may remove a uniform surface from the l end of the pencil.

Upon relieving pressure upon the pencil and the shaft 5, the springs 32will expand (having been contracted during the depressving movement ofthe shaft and pencil),

thereby raising the ring gear and its frame to itsv normal position.vThe cutters in returning to their initial positions do not rotate, dueto a separation of the ratchet -teeth 24 and 25.

The invention having been setforth, ,what isclaimedis:

1. A pencil Sharpener-comprising a casingy I a frame mounted therein andspring supported 'in a raised position, a cutter supportvolving the baseupon downward movement of the frame, divergent cutters carried by thebase, and means for imparting axial rotation Ato the cutters when, thebase is revolved, the hase revolving means'liaving 0p- `ters, a shaftlwith'spiral threads operatively engaging with the tubular guide, wherebyit may receive revoluble movement upon depressing the shaft, ratchetmeans connecting the base and the shaft wherebythe base may rotate withthe shaft upon downward movement of the latter and remain idle uponupward movement thereof,`jand means for imparting revoluble movement tothe cutters themselves. l

3. In a pencil Sharpener, a lcasing provided with; a tubular guide, aspring supported frame mounted normally in a raised position in thecasing, a baserevolubly supported in the frame and provided withdiverging cutters, a shaft with spiral threads operatively7 engagingwith thetubularguide, wherebyY 1t may receive revoluble movement upondepressing the shaft, ratchet means connecting the base and the shaftwhereby the base may rotate with the shaft upon downward movement of thelatter and remain idle upon upward movement thereof, means for imparting-revoluble movement to the cutters themselves,

said ratchet means comprising a stud fixed to and in adeplendingposition from the base and provided with a swiveled slide connectionwith the shaft, andvengaging and disengaging ratchet teeth on the, endof the shaft and the base, whereby the base may rotate with the shaftupon is downward movement and remain idle upon its upward movement.

In testimony whereof he afiixes his signature.

` WILLIAM H. lVlN'lERS.

ing base carried by the frame, means for re-

